mlxsw: spectrum_cnt: Expose devlink resource occupancy for counters

Implement occupancy counting for counters and expose over devlink
resource API.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_cnt.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_cnt.c
index 417c512bc7a2cd30e889a3e8231c13a4a7cc05c5..0268f0a6662aca6393104559926c6827bc4a2ebe 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_cnt.c
+++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_cnt.c
@@ -15,12 +15,14 @@ struct mlxsw_sp_counter_sub_pool {
        u64 resource_id; /* devlink resource id */
        unsigned int entry_size;
        unsigned int bank_count;
+       atomic_t active_entries_count;
 };
 
 struct mlxsw_sp_counter_pool {
        u64 pool_size;
        unsigned long *usage; /* Usage bitmap */
        spinlock_t counter_pool_lock; /* Protects counter pool allocations */
+       atomic_t active_entries_count;
        unsigned int sub_pools_count;
        struct mlxsw_sp_counter_sub_pool sub_pools[];
 };
@@ -40,6 +42,13 @@ static const struct mlxsw_sp_counter_sub_pool mlxsw_sp_counter_sub_pools[] = {
        }
 };
 
+static u64 mlxsw_sp_counter_sub_pool_occ_get(void *priv)
+{
+       const struct mlxsw_sp_counter_sub_pool *sub_pool = priv;
+
+       return atomic_read(&sub_pool->active_entries_count);
+}
+
 static int mlxsw_sp_counter_sub_pools_init(struct mlxsw_sp *mlxsw_sp)
 {
        struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
@@ -62,12 +71,50 @@ static int mlxsw_sp_counter_sub_pools_init(struct mlxsw_sp *mlxsw_sp)
                                                sub_pool->resource_id,
                                                &sub_pool->size);
                if (err)
-                       return err;
+                       goto err_resource_size_get;
+
+               devlink_resource_occ_get_register(devlink,
+                                                 sub_pool->resource_id,
+                                                 mlxsw_sp_counter_sub_pool_occ_get,
+                                                 sub_pool);
 
                sub_pool->base_index = base_index;
                base_index += sub_pool->size;
+               atomic_set(&sub_pool->active_entries_count, 0);
        }
        return 0;
+
+err_resource_size_get:
+       for (i--; i >= 0; i--) {
+               sub_pool = &pool->sub_pools[i];
+
+               devlink_resource_occ_get_unregister(devlink,
+                                                   sub_pool->resource_id);
+       }
+       return err;
+}
+
+static void mlxsw_sp_counter_sub_pools_fini(struct mlxsw_sp *mlxsw_sp)
+{
+       struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
+       struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
+       struct mlxsw_sp_counter_sub_pool *sub_pool;
+       int i;
+
+       for (i = 0; i < pool->sub_pools_count; i++) {
+               sub_pool = &pool->sub_pools[i];
+
+               WARN_ON(atomic_read(&sub_pool->active_entries_count));
+               devlink_resource_occ_get_unregister(devlink,
+                                                   sub_pool->resource_id);
+       }
+}
+
+static u64 mlxsw_sp_counter_pool_occ_get(void *priv)
+{
+       const struct mlxsw_sp_counter_pool *pool = priv;
+
+       return atomic_read(&pool->active_entries_count);
 }
 
 int mlxsw_sp_counter_pool_init(struct mlxsw_sp *mlxsw_sp)
@@ -88,11 +135,14 @@ int mlxsw_sp_counter_pool_init(struct mlxsw_sp *mlxsw_sp)
               sub_pools_count * sizeof(*sub_pool));
        pool->sub_pools_count = sub_pools_count;
        spin_lock_init(&pool->counter_pool_lock);
+       atomic_set(&pool->active_entries_count, 0);
 
        err = devlink_resource_size_get(devlink, MLXSW_SP_RESOURCE_COUNTERS,
                                        &pool->pool_size);
        if (err)
                goto err_pool_resource_size_get;
+       devlink_resource_occ_get_register(devlink, MLXSW_SP_RESOURCE_COUNTERS,
+                                         mlxsw_sp_counter_pool_occ_get, pool);
 
        map_size = BITS_TO_LONGS(pool->pool_size) * sizeof(unsigned long);
 
@@ -111,6 +161,8 @@ int mlxsw_sp_counter_pool_init(struct mlxsw_sp *mlxsw_sp)
 err_sub_pools_init:
        kfree(pool->usage);
 err_usage_alloc:
+       devlink_resource_occ_get_unregister(devlink,
+                                           MLXSW_SP_RESOURCE_COUNTERS);
 err_pool_resource_size_get:
        kfree(pool);
        return err;
@@ -119,10 +171,15 @@ err_pool_resource_size_get:
 void mlxsw_sp_counter_pool_fini(struct mlxsw_sp *mlxsw_sp)
 {
        struct mlxsw_sp_counter_pool *pool = mlxsw_sp->counter_pool;
+       struct devlink *devlink = priv_to_devlink(mlxsw_sp->core);
 
+       mlxsw_sp_counter_sub_pools_fini(mlxsw_sp);
        WARN_ON(find_first_bit(pool->usage, pool->pool_size) !=
                               pool->pool_size);
+       WARN_ON(atomic_read(&pool->active_entries_count));
        kfree(pool->usage);
+       devlink_resource_occ_get_unregister(devlink,
+                                           MLXSW_SP_RESOURCE_COUNTERS);
        kfree(pool);
 }
 
@@ -158,6 +215,8 @@ int mlxsw_sp_counter_alloc(struct mlxsw_sp *mlxsw_sp,
        spin_unlock(&pool->counter_pool_lock);
 
        *p_counter_index = entry_index;
+       atomic_add(sub_pool->entry_size, &sub_pool->active_entries_count);
+       atomic_add(sub_pool->entry_size, &pool->active_entries_count);
        return 0;
 
 err_alloc:
@@ -180,6 +239,8 @@ void mlxsw_sp_counter_free(struct mlxsw_sp *mlxsw_sp,
        for (i = 0; i < sub_pool->entry_size; i++)
                __clear_bit(counter_index + i, pool->usage);
        spin_unlock(&pool->counter_pool_lock);
+       atomic_sub(sub_pool->entry_size, &sub_pool->active_entries_count);
+       atomic_sub(sub_pool->entry_size, &pool->active_entries_count);
 }
 
 int mlxsw_sp_counter_resources_register(struct mlxsw_core *mlxsw_core)